Apparatus for constructing concrete floors.



' F. AMBURSEN.

APPARATUS FOR CONSTRUCTING CONCRETE FLOORS.

APPLICATION FILED MA-Y 31. I916- I Patented Feb. 20, 1917.

2 SHEETS-SHEET 1.

MAIL)! N. F. AMBURSEN. APPARATUS FOR CONSTRUGTING CONCRETE FLOORS.

APPLICATION FILED MAY 31. l96- k Patented Feb. 20,1917.

2 SHEETS-SHEET 2.

PATENT OFFICE.

NIIJS FREDERICK 'AMBURSEN, OF BROOKLINE, MASSACHUSETTS.

APPARATUS FOR CONSTRUCTING CONCRETE FLOORS.

To all whom it may concern:

Be it known that I, N1Ls FREDERICK AM- BURsnN, a citizen of the UnitedStates, and a resident of Brookline, in the county of Norfolk and Stateof Massachusetts, have in vented a new and useful Improvement inApparatus for Constructing Concrete Floors, of which the following isa'specification.

My invention relates to methods of and apparatus for constructingconcrete floors, and its object is to cheapen such construction byeliminating the wooden forms heretofore employed and the skilled laborrequired to make and place the same, and otherwise to improve andsimplify the existing methods.

Heretofore in laying concrete floors it has been customary to use woodenforms or falsework in which the concrete is poured and which are removedafter the concrete has set, such wooden forms requiring skilled laborfor their construction and being destroyed by their removal, so thatbeing capable of but one use they represent a relatively large item inthe cost of concrete, floor construction. 1

By means of the present invention I am able to greatly reduce this itemand save time, labor and material by the use of sectional metallicarches frictionally-isup-ported in channel-irons, such arches andchannels constituting a mold or form in which the concrete is poured toform the floor. The molds or forms so constructed by such metallicmembers may be placed in position by unskilled labor and after theconcrete has herdened may be removed for further use as distinguishedfrom-the wooden forms of the prior art which are destroyed by removal.Furthermore, such forms require very few temporary supports, becausethe'strength of the channel-irons will enablethem to span a considerablespace, for instance about twenty-five feet, and support the. concreteload placed thereon, while the wooden forms of the prior art must besupported at relatively short intervals by false-work.

One embodiment of my invention is shown in the accompanying drawings, inwhich.

Figure 1 is a transv'erse section of a concrete floor constructed inaccordance with my method, the forms being shown in position. Fig. 2 isa plan view showing the forms before the concrete has been poured. Fig.3 is a similar plan view on a smaller Specification of Letters Patent.

Patented Feb. 20, 1917.

Application filed May 31, 1916. Serial No. 100,787.

scale, showing one mode of attaching the floormg to the side wall. Fig.4 is a fragmentary view showing in transverse section a modification'ofthe form represented in Flg. 1. I

Y In the particular drawings selected for more'fully disclosing myimproved method and apparatus for practising the same, 1, 1 representlight channels, the size and strength of which will of course varyaccording to the span of the floor, the webs of said channels beingapertured at inter vals bf about two feet to receive the bolts 2 whichpass freely through said holes and "have threaded engagement with theclamps 3 which, as shown in Figs. land 2, are square bars having theirends chamfered to conform to the slant of the inner faces of the flangesof the channels. In the preferred form of my invention the upper facesof the clampsare grooved to receive the reinforclng rods 4, 4, whichextend longitudinally of the channels a short distance above thewebsthereof. As shown in the present instance, said rods may be secured tothe clamps by means of wires 5,'or in any other suitable manner.Spanning the space between each pair of channels is a metallicarch-plate, preferably of steel about one- /eighth of an inch thick,each end of the arch-plate resting as shown on the web of a channel.-The arch-plates are held in frictional engagement with the flanges ofthe channels by meansof the clamps, which, when the bolts 2, 2 aretightened, will be drawn toward the webs of the channels and force theends of the arch-plates against the flanges thereof.

As shown in Fig. 3, the channels will be temporarily supported onstringers or other false-work X, which may be placed as far astwenty-five feet apart, one such stringer only being shown in Fig. 3,and the arch-plates 'for convenience in handling preferably are made insections about five feet in length, the several sections 6, 6, 6" beingshown in the present instance as overlapping.

After a floor-mold has been constructed in the manner above set forth,the concrete 11 is poured and allowed to harden, and after it has setthe channels and arch-plates are removed by unscrewing the bolts 2,Whereupon they may be used over again. as obviousl they are notdestroyed by removal.

T e clamps 3 are of course left in the concrete and can be used forfastening steel lathing for the ceiling, the bolts 2 in such case beingemployed for this purpose.

In the modification shown in Fig, 4, the

clamping member is shown as a rod 8, around 7 which passes the wire loop9, and the ends of said loop project through the aperture in 1 the webof the channel, so that assaid ends are twisted around the .block 10 ofsuitable material inserted through the loop, the ends of the arch-plateswill be securely held in position I against the flanges of the channel.

In this case, after theconcrete' has set, the

i wire is untwisted and the channels and archplates removed as before,whereuponthe wire loop 9 can be used-Ifor fastening the 'lath for theceiling."

As shown in Fig; 3, the ends 4 of the rein- I forcing rods tjextendsinto the Wall 7 of the building and thereby strengthens the juncture ofthe flooring and the wall, the entire structure of course beingmonolithic.

By means of the method herein described the cost of forms and false-workmay be reduced to about fifty per cent. of that required when suchfloors are'constructed by existing methods.

It will be obvious to those skilled in the art V that variousmodifications may be made, both in the methodherein described and alsothe apparatus whereby such method is carried into effect, withoutdeparting from the principle of my invention. 7

subscribed my .1916.

W II csses': '4 p Havin thus described illustrative embodiments 0 myinvention, without however limitingthe same thereto, what I claim anddesire to secure b Letters Patent is- 1. Apparatus or constructingconcrete,- floors comprising spaced channels having upwardly extendingflanges, means for temporarily supporting the same, metallic archplateseach having its ends resting on the webs of a pair ofadjacent channels,and means for clamping the adjacent ends of each pair of arch-plates-tothe flanges of a channel. 2

2. Apparatus for constructing concrete floors comprising spacedchannels, means for temporarily supporting the same, metallicarch-plates each having its ends resting on a pair'of adjacentchannels,clamping members arranged transversel of said channels and locatedbetween the ii anges thereof, the ends of said arch-plates being betweensaid flanges and the ends of said clamping members, and bolts passingthrough apertures in the webs of said channels and havingthreadedengagement' with said clamping members. In testimony whereof, Ihave hereunto name this 29th day of May,

Geo. K. WoonwoRTH',

E. B. ToMLINsoN.

